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<head>
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    <title>Document</title>
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<body>
    <div id="root"></div>
</body>
<script>
    // 第一个react程序
    //    ReactDOM.render(组件或元素,元素)
    // ReactDOM.render( < h1 > Hello, world! < /h1 > ,
    //     document.getElementById('root')
    // );
</script>

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